/Engine/Source/Runtime/Engine/Classes/PhysicsEngine/BodyInstance.h
Changes the current PhysMaterialOverride for this body. Note that if physics is already running on this component, this willnotalter its mass/inertia etc, it will only change its surface properties like friction and the damping.
void SetPhysMaterialOverride ( class [UPhysicalMaterial](API\Runtime\PhysicsCore\PhysicalMaterials\UPhysicalMaterial) * NewPhysMaterial )